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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6d7229f70c994b3103336f9ec68936cd804ee1c0092c3e6bf5a28d3b6d1064' 
  AND token = 'gRLQri/L4gTRY311HcN2ECsx0yMWbAlvamtrgPnXSgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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