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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e0622ea91529c813f419d1f251c260e8330f023b6cec640f4ba814d0bb7697' 
  AND token = 'o2E3md97oIo4TmMuae3GIGmjFCFrHdzJ+ZxZ8B6wT7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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