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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74743d1b8285c8d897dc7e210b0b8f64d70200388fd35bf4de09d69827ef536c' 
  AND token = '57hw87gvCyIHstVCQj0UqegrUx9cr/LNdbmLoLMiTaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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