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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b365dd998e848c242a5ffbb56e32246fe3088ea16c4e4e48b4119804ad19be8' 
  AND token = 'TV/pf8N+vPs6hq4DiTFeNlmFOpefsqsAOOyE97olwYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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