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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c99ace51e089bf7862fba1ef96b8e7e08f9792af628e6727a2e43ead2c6d64' 
  AND token = 'eYg4Rd5zsGrxYblRLnmu10/1FmMx9Y4oYWHZRFqwO4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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