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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a900cd3dd041d45797282c6ec64413f32f94552c9c72794d513247f4b0519d' 
  AND token = 'By8ccZrd1krUidxKBbxsXy2wuGm6B1d+WoQ6BHGcP/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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