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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b1742715e852b676d30dd3d52ef2301035d2afde4c076790962d94c4712cab' 
  AND token = '02F7I3Ad8Fu+3DQ7q1/WbEzsGQdUlOGtPWcSO/0uJ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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