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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830790685dd949d3bb67d17da8b58b589544d27d62636dd8a0755daf3a4e259d' 
  AND token = '7D4VXWb/AqqM5S4/tdA7sTMmtS1zp2BxPvOnbzFgaIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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