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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a9f77db941d50e1e0200b0639f57aaef37e7e1e6a2c30fa3d09f29cb8bd88a' 
  AND token = 'bOoA+Ub/gdwgwOGJF86vib+D23h8j+Ml1r4t1B4eOXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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