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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0894b54bec9be6a4ded62f870ac041a219bbc5c67707b9a354c34b2e5d37cf' 
  AND token = 'pNdtVn7WYTh08LkA1gONaw8pa5IjjZX/HiSyY/EG2q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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