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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b517d93aea8b54015e8d3d5a55bcc3a8b61f6d6089b869d5d6b86575c14064e4' 
  AND token = 'uyMAM2ifL8vX97Jmf5lx0zVd3ari49A8Q4BQLW9PGn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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