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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77183f73a8fae727428f4b1a56fe5951a27393719b4a7c0c1aa0a968e242303b' 
  AND token = '1aHDupJx1bl/3Obiz79ny+KZ1HtHyGd50Rlylve7XCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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