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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0bad61f4b7f5c724def3b56886cdffc8a4a6649ce6e0245c69cdd0288b4ee7' 
  AND token = 'V0ZpfaPagtZnIC5Dn7YOQnD2ghzmyGMcZSvj1K1w2nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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