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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93c7f652dbc1d4cc795b7989af95fecdbf99600c2c6a539cb7322bdce2ad9d9' 
  AND token = 'K0za9JWf2XE/WHLagkdQ8+CT+QBHmAb8i680c6+jsxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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