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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cedf50d52b381d9c470c374bb0a5ede1943671e662426461910eff0652e341a' 
  AND token = 'm5hw2d3GRamT9A9ZwYXS7JWdX2kes1o9Wm7iSYgP6FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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