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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a7167bab6bf022ab013adf95772cd70a1a43d8f8d477d8c6c4767bdfec2e69' 
  AND token = 'wUF/432R1C9/S2BGuuFmG08Vp6ODalLontjc+WRncjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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