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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87833eba2a57223bbb0953958acc604792c1836e37b58653c2cddeaa6fd4f045' 
  AND token = 'iA1mP53s+tya3YeS7JJ5JcjSkEhUyWossOIYZWwEnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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