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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaca4fe0d218f21625d9338c9dd8e92eb279808abfd9874306cfd6c50c06825' 
  AND token = 'V2IIQaI14oPN5cUf5sw0WK4aNiLwZhtz64WyTPpm8ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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