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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318680bf69de54a30b6ae01f7a3d3c41ae3b0f8a1a9dd89cb06f8e3c34713210' 
  AND token = 'LMbEdukyJvAzMKVsIAgRq6c46am+Cl92uwkmQ7NGExU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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