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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1efdabac9e672d14fbf0ac512e3b4649687122c7f6c4b1470e052f66a952156' 
  AND token = 'NpqW3PDRuhQMv7gxD4qlsEVnK1aUVyM/4K5Bf8kLG0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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