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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693d7279b71f617b26b2c71637631bf586465afbc5ffa1d378979b22f8d77ec4' 
  AND token = 'sXTiyScx3TCm2gmg6LGval75JTJIn9t8fudLt/ykPIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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