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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e050ec6a4234917dc89c8f378380a543ba8e6ab4784d307e2ccd58e8988403c8' 
  AND token = 'KK0jlVGEP9Sr4A1022cCHGEJ1Urgv+NVwZHd784Gd+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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