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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fdcaee195c4f85f023552f12d855d60d0312b9f9701db5f70b7635567f454b' 
  AND token = 'gxvlFs1wGlgwCkhcCNPdJ8Uf9MBblv/418AusJuy3M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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