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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7380de688acc9126c703eff1bd24fe497ed4bd91a03ef3d2e624508c95ec4b6a' 
  AND token = 'e5CuUfKcAkVfr4uPiyYv0X49RFtA4lBtwEohvOp5T+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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