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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955f9b246e6f6366aa108f8a5ba9a66d533f70d7ba310289dc40b6f2c27b8e20' 
  AND token = 'X82zSxfX7tKnWD6mLVUTI1HGPEW7RuU1c+9VrQW5Aew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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