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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c795c5f4991ceb8fa4b7a19335a7ba3a38383819f5a35638e971889c5811803d' 
  AND token = 's0cEVwJY1DBen8qC7VMGuFTiu9ZGGAYZTsc/aX2nSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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