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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050d4670ba596b58a0bc35f8afbf01073be956a4c0376e80a9583c4a749a0492' 
  AND token = 'M8YyBJKMBayvFBic7NvCfwBKqCCe/dEEGMOqP+SwUaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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