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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e6912138691d51cda1e22bc171fa6c5c5e22986aeb33b5bbc3ee910fdb9b18' 
  AND token = '8lVlPmI82vieso4q0UcBaBu4UBb3PVTc1ltKi83GA5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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