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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0999e8d058162c58be6a8755aff0498135d1944604c8d2a3f843a934c44ee3' 
  AND token = 'vGy/+AeLXCAb8pLw4biLN0fiP3bZAPGc0eX5kJdexjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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