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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7590589307bfad712bd42f6e5321f1915a5212fe9a722670fc3cf961a0fc8da' 
  AND token = '6Fw6ZbtD6JCiw1tQxe6+O7ihODjCUTwc0ro9j0Bsw4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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