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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb855ebd5002cc41fdb01da83b5504790d3c3e4a158c4eb02bd9079bf8709c13' 
  AND token = 'xy/CbWm4qmYcyza4ixtPPcbgi5SB5U0tQEVM3cvBQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}