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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8985b87d87f9ed79f23dea8c27cdc651046615a443a0efad2f15781e68d3883' 
  AND token = 'EI+TmWHdk2VeAFpYNIl2r4J486Z6gm2um14qiJlsTZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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