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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2166459d5b811edb0a51f8a293a30b46e293375ccee3c95fd26954e7d954994' 
  AND token = 'U4Pwl0MZDkq9R3yObwxh84IJtowBgT5ZU8jM/dQ1Esc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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