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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec81e4135c76e4ff9ba7c505bce5641a84dc443d1b957a3753255094614a877' 
  AND token = '0JhqPFPAXkjj0Hfc5oj68tCCu/VwcRG+s0E97T1Aqlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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