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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a0971b99795816dd9d6ebe52e13e0ce91f1a8677134b3d8ab4ec96ae7d0dea' 
  AND token = 'zkkz6yshnJ+HgoLSGbJysADVJoidb1EJn00+9DEoJmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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