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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e251ded845dc89510f28a960e82bd3850f4a38d8ba942db3afc7e627aace57' 
  AND token = 'Xal2sqFKKUFnWLaC2dTHa5Y1L6YJESpPt/NmzQn+9Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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