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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fb6cd8b6511e7b29987887208ff4fa93eda4cb9165dff3b4c6f5ff18a2d911' 
  AND token = 'BpAPQ9kB1suUqRZUgdUdC31yr5oL2tblaVv4/Vlz0SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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