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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b03fb100d00e9574bb734a67fa1dca422f0e49381d51edf1feb70ec35e9ae8' 
  AND token = 'cf1anCmfhuTX7PVYf8NgChTnqTP5EbcuXJsL4sm+kAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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