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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808cc7b4ac8a9ff803e1c5ee0ec1250da1a272b97b58a25be7c919452d8bb2a0' 
  AND token = 'ppRYzBdJdCuGBaCoL7WwZGqn1AbVccWDJJehJN4q1R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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