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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1840ff00d98985320592ce3c2a47280a0414469c1d0ba957939e5b9570f486b' 
  AND token = 'VcSlzmRM5441VK+QagtZFO8ooXa+pbwqWmxPS8nkaYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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