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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1c99da383dbc4e9271d143bedab3a84549ef348679cde289c5e408fdff6a3f' 
  AND token = 'g+2qIcpfk4bDOg51f1Kdn12OO/96/cZ4MJtYPzrHNzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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