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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a810c1e27ad893eddf9ed0bc9577d46156189a8289a81b22868d39de4800869e' 
  AND token = '7WGvbSb0/fZ2Pr0n9GZPHZ6XoKK1x9ScN6wL6YVAKWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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