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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1d1560faa2da24b5170fd5229fe8d0b3e23923f07b4564f8fda4d51747bf87' 
  AND token = 'lueT1Bqvj2vly/KnTDn50lFrw5I/MEG1k7nvkBiIgo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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