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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b96aca0e53b03894628da521744795bb7743ec0389c42c25752e5aa2acc194a' 
  AND token = 'hvH+0c9C+ifekIr6SlgDTErEqoyVlKxNdSmE+1e9fgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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