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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d01e83fd7eab9f67122a2c0d4f82e060e39ee54714c2c7a6047187722a1a75' 
  AND token = 'EmtTA7yddcs6CxPSjSQ1OBWuh9u+Ctn/vw2lqys46PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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