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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bd38db63c9daa1cbad8537b3e83ded87ec633c6bb6eaa6441b063fb0839232' 
  AND token = 'HLkOjV/k1I8fbhu53+wgsGs5GAQuv/cgsDHnICNymNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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