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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32387479b9fb69c68d8f93870dc4b14a68715ce9efe0992ee9b60ad27c3321dc' 
  AND token = '0pP5tT5Ll8FOPJZJP65wP+PxL/furdHMRy3SSyzr66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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