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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6399606fe248a20706df66a7aa59a56cdfa05a524d65170e14f7fa8294f148' 
  AND token = 'zNuPc/8sz5JXp2hXvl/Gd0f7C0aQJ5HPGsGZokv7tLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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