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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0b824603daefb1902a0a9215fd40ec896253cf6c20872c8c45016b4413ee39' 
  AND token = 'Fi27j4HJ0laTC9p1E08X5GlK/u85PkMjX3npxDmR0TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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