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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0bfadd5965335da620504859ce68b500d941819000e7e14a11e821d4812af6' 
  AND token = 'ylGYH/TvSBpQVGQsD8T1S9B0FwQ6pPNwIrFu7GeZiBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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